Q700 SCSI issues: Bluets and Granola bars!?

[paws]

Here is a weird one:

I have a SCSI2SD 5.1 that I've been running my Quadra 700 off for a while. This works great. Before that, I had also run it from an ACARD IDE->SCSI bridge with CF adapter. It still works great.

I've moved the ACARD into an external SCSI enclosure that used to have a very noisy drive. The enclosure also works great with noisy drives, or with either of my two solid state SCSI solutions.

Except: I connect both at the same time (on different IDs) I get a flashing dialogue that says "Bluets & Granola bars". It shows up just before it would normally start loading extensions.

It doesn't matter which one is in the external enclosure and which is internal. It boots fine from either board, whether connected internally or externally, so long as they're not both connected at the same time.

Make it stop? Please?

 

[cheesestraws]

This is... believe it or not, the text that replaced "Welcome to Macintosh" in the system file when the Welcome to Macintosh box was replaced with the new splash screen thingy.  So it means that something is breaking very early in the startup sequence; and if it's flashing/flickering, presumably something is happening in a tight loop?

No idea beyond that, this has to be one of the least helpful symptoms one can reasonably imagine

 

[paws]

Right. I could find some references to it, but nothing that matched it specifically to SCSI issues. It's definitely flashing like it's being redrawn over and over.

The drives are on separate SCSI IDs, but it just occurred to me that SCSI2SD can emulate multiple SCSI drives. I wonder if it's doing something funny or I set it up wrong somehow.

 

[aperezbios]

This sounds like it could be a double-termination issue. Does the external enclosure have its own termination? Try disabling termination on whatever device is mounted externally, and see if it makes any difference in behavior on boot.

 

[paws]

I've tried both with and without termination. With an active terminator on the enclosure, I either get the blinking question mark or sad Mac and an error (which I don't remember). So the error in question is only with no termination.

I tried a bunch of things earlier, as far as I remember the terminator didn't make a difference when it's only one device...

 

[paws]

Ah! The SCSI2SD v5.1 has an option to enable/disable termination. Unchecked it, and now it works. Wonder if that option basically means the SCSI2SD hogs the entire bus...

Edit - now I see - it's because both the ACARD bridge and SCSI2SD have built-in terminators, and they were both enabled. Frailty, thy name is SCSI...